package com.spzx.product.controller;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONArray;
import com.github.pagehelper.PageHelper;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.web.controller.BaseController;
import com.spzx.common.core.web.domain.AjaxResult;
import com.spzx.common.core.web.page.TableDataInfo;
import com.spzx.product.api.domain.ProductSkuVo;
import com.spzx.product.domain.Product;
import com.spzx.product.domain.ProductSku;
import com.spzx.product.query.SkuQuery;
import com.spzx.product.service.*;
import com.spzx.product.vo.*;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ThreadPoolExecutor;

@Slf4j
@Tag(name = "聚合数据")
@RestController
@RequestMapping("/channel")
public class ChannelController extends BaseController {

    @Autowired
    private ICategoryService categoryService;

    @Autowired
    private IProductSkuService productSkuService;

    @Autowired
    private IBrandService brandService;

    @Autowired
    private IProductService productService;

    @Autowired
    private ISkuStockService skuStockService;

    @Autowired
    private IProductDetailsService productDetailsService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private ThreadPoolExecutor threadPoolExecutor;

    @Operation(summary = "获取首页数据")
    @GetMapping("/index")
    public AjaxResult index() {

        List<CategoryVo> levelOneCategory = categoryService.getLevelOneCategory();
        List<ProductSkuVo> topSale = productSkuService.getTopSale();
        IndexDataVo indexDataVo = new IndexDataVo();
        indexDataVo.setCategoryList(levelOneCategory);
        indexDataVo.setProductSkuList(topSale);
        return success(indexDataVo);
    }

    @Operation(summary = "获取分类嵌套列表")
    @GetMapping( "/category")
    public AjaxResult category() {
        return success(categoryService.tree());
    }

    @Operation(summary = "显示商品列表")
    @GetMapping("/skuList/{pageNum}/{pageSize}")
    public TableDataInfo skuList(
            @Parameter(description = "当前页码")
            @PathVariable Integer pageNum,

            @Parameter(description = "每页记录数")
            @PathVariable Integer pageSize,

            SkuQuery skuQuery) {

        PageHelper.startPage(pageNum, pageSize);
        List<ProductSkuVo> list = productSkuService.selectProductSkuList(skuQuery);
        return getDataTable(list);
    }


    @Operation(summary = "获取全部品牌")
    @GetMapping("/brand")
    public AjaxResult selectBrandAll() {
        return success(brandService.list());
    }

    @Operation(summary = "商品详情")
    @GetMapping("/item/{skuId}")
    public AjaxResult item(
            @Parameter(description = "skuId")
            @PathVariable Long skuId) {

        //bitmap
        String key = "product:sku:data";
        Boolean flag = redisTemplate.opsForValue().getBit(key, skuId);
        if (!flag) {
            log.error("用户查询商品sku不存在：{}", skuId);
            //查询数据不存在直接返回空对象
            throw new ServiceException("用户查询商品sku不存在");
        }

        ItemVo itemVo = new ItemVo();

        //有返回值的异步方法
        CompletableFuture<Long> futureProductSku = CompletableFuture.supplyAsync(() -> {
            //获取sku信息
            ProductSku productSku = productSkuService.getById(skuId);
            itemVo.setProductSku(productSku);
            return productSku.getProductId();
        }, threadPoolExecutor);

        //异步执行，并且获取商品sku方法的返回值，本身没有返回值
        CompletableFuture<Void> futureProduct = futureProductSku.thenAcceptAsync(productId -> {

            //获取商品信息
            Product product = productService.getById(productId);

            //商品信息：轮播图列表
            String[] sliderUrlList = product.getSliderUrls().split(",");
            itemVo.setSliderUrlList(sliderUrlList);
            //商品信息:商品规格列表
            JSONArray specValueList = JSON.parseArray(product.getSpecValue());
            itemVo.setSpecValueList(specValueList);
        });


        //异步执行，并且获取商品sku方法的返回值，本身没有返回值
        CompletableFuture<Void> futureProductDetails = futureProductSku.thenAcceptAsync(productId->{

            //获取商品详情图片
            String[] detailsImageUrlList = productDetailsService.getProductDetails(productId);
            itemVo.setDetailsImageUrlList(detailsImageUrlList);
        });


        //异步执行，并且获取商品sku方法的返回值，本身没有返回值
        CompletableFuture<Void> futureSkuSpecValue = futureProductSku.thenAcceptAsync(productId -> {

            //获取商品规格Map
            Map<String, Long> skuSpecValueMap = productSkuService.getSkuSpecValue(productId);
            itemVo.setSkuSpecValueMap(skuSpecValueMap);
        });

        //异步执行，不需要获取上一个方法的返回值，本身也没有返回值
        CompletableFuture<Void> futureSkuPrice = CompletableFuture.runAsync(() -> {
            //获取商品最新价格
            SkuPriceVo skuPrice = productSkuService.getSkuPrice(skuId);
            itemVo.setSkuPrice(skuPrice);
        }, threadPoolExecutor);


        //异步执行，不需要获取上一个方法的返回值，本身也没有返回值
        CompletableFuture<Void> futureSkuStock = CompletableFuture.runAsync(() -> {
            //获取商品库存信息
            SkuStockVo skuStock = skuStockService.getSkuStock(skuId);
            itemVo.setSkuStock(skuStock);
        }, threadPoolExecutor);

        //等待所有任务都完成
        CompletableFuture.allOf(
                        futureProductSku,
                        futureProduct,
                        futureProductDetails,
                        futureSkuPrice,
                        futureSkuSpecValue,
                        futureSkuStock)
                .join();//这是一个阻塞操作，程序会在此等待直到所有任务都完成。

        //返回商品详情
        return success(itemVo);
    }
}